A lovely analogy from Play Emacs like an Instrument: https://200ok.ch/posts/2018-04-27_Play_Emacs_like_an_Instrument.html
3d printers are awesome, but text editors have a powerful generic utility that make them a very valuable part of your toolbox.
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I'm fascinated to learn that people are discovering weaknesses in state-of-the-art bots for playing Go, such that a novice player can reliably win: https://goattack.far.ai/human-evaluation
This suggests that self-play doesn't always generalise: it's not sufficient to beat earlier versions.